Vat dye and process of making same.



UNITED STATES ATENT OFF cE.

onone KALIscnnn, or mAnxnonr-on-THE-Mun, GERMANY, ASSIGNOR-TO CASSELLA COLOR COMPANY, on NEW YORK, N. Y.

a VAT DYE AND PROCESS OF MAKING SAME.

HofDrawing.

of which the following is a full description.

. soda lye, vats of a yellow to red color result,

to brown shades of excellent fastness.

Whereas the a-B anthrimids which may be obtained by condensation of ,B-chlo'ranthraquinone derivatives with -anthraqui none derivatives are useful vat. colors, as may be seen from the description of-Patent No. 863,397 the a-a-anthrimids resulting from the condensation of a-chloranthraquinonederivative's with a-amidoanthraquinone derivatives could not in practice be used as.v

vat colors because their leuco products possess no affinity for cotton. I have now discover d that these a-asanthrimids when heated with anhydrous aluminium chlorid,

alone or in the presence of a diluting agent, I

are transformed into new compounds which are chemically absolutely different from the starting materials; and which possess the valuable property to dye cotton full'brownish-orange to brown shades from easily soluble vats. It cannot beascertained with certainty in which manner the reaction with aluminium chlorid takes place; it ishowever very probable that a condensation takes place while forming new inside (nucleus) aggregates. This conception is especially borne out by the considerable deepening of the shade of the color solutions of the new dyestufi' (in concentrated sulfuric acid) as compared with those of the starting products. Whereas-the starting products 1 dissolve with a greenish color, the color of the solutions of the new dyestufi in concentrated sulfuric acid is an intense violet to blue. The sulfuric acid, reaction is particularly characteristic for the new dyestuffs, and proves at the same time that they are absolutely diflerent from the dyestufis described in Patent No..863,397. v

. The new dyestufi's are a dark powder in the -v dry state, insoluble in water andcontrary to the a-a-anthrimid used as the 'starting; productalmost insoluble in the customary organicdissolving. agents. When being treated with hydrosulfite and caustic suited 1 for 'dyeing cotton brownish-orange Specification otLetters Patent- Patented Aug. 8 19 11. Applicationfiled April 1, 1911. Serial No. 618,395.

The process of working is illustrated by thevfollowing example:

Example: 10 kilos a-a-dia'nthraquinonyl .1.5.diamidoanthraquinone (obtained by coni v densing one molecular proportion of 1.5 diamidoanthraquinone with two molecular proportions of" a-chloranthraquinone) are thoroughly mixed with 50 kilos anhydrous aluminium chlorid, heated to- 220-240 C. and maintained at this temperature until a sample dissolves in concentrated sulfuric acid with a purplish-blue color'which does not increase in intensity.- The product of reaction is then: treated with hot water to remove thera-luminium chlorid. The purifiedv dyestuif' represents a brownish-black powder insoluble in water. It is insoluble in hot anilin, but dissolves in cold concentrated sulfuricacid with a purplish-blue color; when diluting this solution with water, an orange-colored precipitate forms. In contradistinction thereto the a-a-dianthraquinonyl. 1.5 dianiidoanthraquinone,

By heating other a-a-anthrimids with anhydrous aluminium chlorid, dyestuffs of similar properties are obtained. For in stance the dyestufii' prepared by starting from the a-a-dianthraquinonyl.1.8.diamidoanthraquinone (obtained bycondensing 1.8 diamidoanthraquinone with a-chlorauthraquinone) dyes a greenish-brown, and

the dyestufi. from a-anthraquinonyl.1.ami-- doanthraquinone (obtained by condensing a-amidoanthraquinone with a-chloranthraquinone) a brownish-olive, shade;

1. The process of making new vat dyestufl's which consists in heating a-u. anthrimids (obtained by condensing an a-amidoanthraquinone compound withan a.- chloranthraquinone compound) with anhydrous aluminium chlor1d substantially as described. A

2. The process of making anew v at dyestuff which consists in heating a-a-dianthraw u s db (obtained by condensing 1.5 diamidoanthraquinone with a-chloranthraquinone) with anhydrous aluminium chlorid substantially as described.

3. As new articles of manufacture the vat dyestuffs obtained by heating a-a-anthrimids (obtained by condensing an a'amidoanthraquinone compound with an 11-011101'311- thraquinone compound) with anhydrous aluminium chlorid, said dyestufl's being in their dry state dark powders, insoluble in water, very little soluble in organic solvents, soluble in concentrated sulfuric acid with a violet to blue color, dyeing cotton from a yellow-to red-colored vat brownish-orange to brown shades fast to washing, chlorin,

' and light, substantially as described.

4:. As a new article of manufacture, thevat formula scenes dyestufi obtained by heating wwdianthraquinonyl.1.5.diamidoanthraquinone of the (obtained by condensing 1.5.diamidoantbraquinone with a-chloranthraquinone) with anhydrous aluminium chlorid, said dyestufi' being a brownish-black powder, insoluble in water and hot anilin, soluble in concentrated sulfuric acid with a purplish-blue color, and being precipitated from such solution by addition of water, in the shape of orange flakes, dyeing cotton from an orange-red colored vat brownish-orange shades fast to washing, chlorin and light substantially as described.

In witness whereof I- have hereunto signed my name this 21st day of March 1911,

in the presence of two subscribing witnesses.

GEORG ISCHER.

Witnesses: r

JEAN GBUND, CARL Gmmn. 

